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# Give an example of a combination reaction between an element and a compound.

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## Combination reaction: A synthesis reaction or combination reaction is a type of chemical reaction in which 2 or more reactants combine to form a single product.Example: Formation of Sulphur trioxide (SO3)$\underset{\left(\mathrm{Sulphur}\mathrm{dioxide}\right)}{2{\mathrm{SO}}_{2}\left(\mathrm{g}\right)}+\underset{\left(\mathrm{Oxygen}\right)}{{\mathrm{O}}_{2}\left(\mathrm{g}\right)}\to \underset{\left(\mathrm{Sulphur}\mathrm{trioxide}\right)}{2{\mathrm{SO}}_{3}\left(\mathrm{g}\right)}$In this example, Sulphur dioxide is a compound and Oxygen is an element.Element: A pure chemical substance composed of the same type of atoms. Example: Oxygen molecule (O2) contains 2 atoms of the same element called Oxygen (O).Compound: A chemical substance in which two or more elements are present in a fixed proportion. Example: In Sulphur trioxide,

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